[K12OSN] Slow speed

Dennis Daniels ddaniels at magic.fr
Sat Jan 22 20:37:47 UTC 2005

Were you able to do that remotely? If yes, how?


Mark Raine wrote:
> This may sound simple but we have noticed a big increase in speed by
> decreasing the client resolution. just a thought.
> On Sat, 22 Jan 2005 10:37:25 -0500, Jeff Kinz wrote
>>On Sat, Jan 22, 2005 at 10:22:05AM  0100, Bjørn Roger Rasmussen wrote:
>>>Now with K12LTSP as system the people at the school are complaining about 
>>>the speed. High response time when they shall start or use normally 
>>>programs etc.
>>>Before I began to run K12LTSP I used Skolelinux 
>>>school liked that solution, but it was a night mare for me to maintain the 
>>>network. I did not get any complaint about the speed when I run Skolelinux.
>>Does this mean that you used to run all your systems with local hard
>>drives?  If so, then your current slowness problems is a result of
>>either your network, or your server.
>>>- Intel P 4 1.6 GHz, 1 GB RAM, 80 GB IDE harddisk WD with 8 MB cache. 100 
>>>Mbit/s network.
>>I suspect that since you have a 100 Mbit network, assuming all the
>>thin clients are using 100 Mbit cards and not 10 Mbit cards, that 
>>your problem is your server, not your network. Specifically you have 
>>three potential weak points in your server.
>>	1. For 10-15 X clients, 1 GB of ram is very minimal. 
>>Depending on what applications are being run, you probably need more
>>than that. How to find out: when all your clients are being used (really
>>being used, not just logged in) run top and look at how much swap space
>>is being used. If you are using a lot of swap that is an indication that
>>you need more RAM. What window manager and applications are the clients
>>running? Based on my past experience, you need at least 100 Mb of RAM
>>for each client even when using a minimal window manager(icewm) and
>>doing only internet browsing or word processing. This means that your
>>server needs at least 1.5 GB of RAM and based in price points you would
>>be better off going right up to 2 GB. Buying RAM in large chunks 
>>costs less money, and if your client machines are doing anything 
>>more than a minimal amount of work you will need more than 100MB per 
>>You may have heard reports of people running 40-100 clients with 
>>only 1 GB of RAM.  This works ONLY when the client machines are not running
>>X-Windows (being used only as telnet/terminal appliances).
>>1GB of RAM should be about (USD) $100 - $150
>>	2.  CPU 1.6 GHz isn't real fast.  Evaluate the output of top or
>>other load monitoring tools to see if you can benefit from a faster
>>CPU.  A 3 GHz P4 runs about (USD) $300.
>>	3.  Disk.  If you are hitting the disk for swap space definitely
>>upgrade your RAM first. Then, if the applications are still making heavy
>>use of the disk, you may want to upgrade to a disk with more cache
>>and/or a faster transfer rate.  SCSI and SATA are both generally better
>>than IDE, albeit more expen$ive.
>>	4. (4 of 3 :)  Network architecture - make sure all clients are
>>running at 100 Mbits and not 10 Mbits.  Make sure all switches or 
>>hubs repeaters, and cards are running full duplex mode.  Make sure 
>>all the cabling is clean with no reflections (reflections cause 
>>collisions and retries).   Run ifconfig on each client and the 
>>server to see if any of your machines are seeing collisions.
>>>The server shall serve about 10 – 15 thin client computers. The thin client 
>>>computers are old computers with specifications running from Pentium 166 
>>>MHz with 64 MB RAM and better.
>>Linux/Open Source:  Your infrastructure belongs to you, free,
>> forever. Idealism:  "Realism applied over a longer time period"
> http://www.scaled.com/projects//
>>http://www.fedoratracker.org http://www.fedorafaq.org
>>Jeff Kinz, Emergent Research, Hudson, MA.
>>K12OSN mailing list
>>K12OSN at redhat.com
>>For more info see <http://www.k12os.org>
> Mark Raine
> Computer Services Coordinator
> Tisdale School Division #53
> mark at tsd53.ca
> 306 873-2352  EXT: 505
> _______________________________________________
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> K12OSN at redhat.com
> https://www.redhat.com/mailman/listinfo/k12osn
> For more info see <http://www.k12os.org>

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